John meiggs ewen



(No Model.)

J. M. EWEN.

PRISMATIG WINDOW. No. 595,263. Patented Dec. 7,1897.

E J/ 5f 1 .Z w y y E UNITED STATES PATENT OFFICE.

JOHN MEIGGS EVVEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LUXFER PRISMPATENTS COMPANY, OF SAME PLACE.

PRISMATIC WINDCW.

SPECIFICATION forming part of Letters Patent No. 595,263, dated December'7, 1897.

Application filed October 2, 1897. b'erial No. 658,782. (No model.)

T at whom it may concern.-

Be it known that 1, JOHN MEIGGS EwEN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Prismatic Vindows, ofwhich the following is a specification.

My invention relates to prismatic windows, and has for its object toprovide a new and improved window of this description.

My invention is illustrated in the accompanying drawings, wherein-Figure l is a View of a prismatic window embodying my invention. Fig. 2is a section through the same. Fig. 3 is a front view sho\ ing amodified form of my device.

Like letters refer to like parts throughout the several figures.

When the window to be provided with prism-lights is set at a distanceback of the wall of the building or, in other words, is provided with adeep reveal, the light is obstructed by the wall, and the efficiency ofthe prism-lights is very much reduced. Moreover, the arrangement ofthese prism-plates is liable, under certain conditions, to interferewith the architectural effects of the building, and it is a part of myinvention to so arrange them as that they are detached, so to speak,from the scheme of architecture and do not therefore interfere withthose effects. Again, in the manufacture of prism-plates it will beobserved that we use certain factors or elements which under existingconditions consist of prism-lights four inches square. It will hetherefore seen that any attempt to fit the window-opening exactly and toprovide is often highly important, if not essential, to arrange thesewindow-plates so as not to interfere with the action of the ordinarywindow and not to disturb or prevent ventilation by the ordinary windowand not to prevent the washing or cleaning of the ordinary window. Theseobjects are also accomplished by my invention. I have called thisprismplate when so applied a foriluX. In order to avoid thesedilliculties and to produce the results hereinafter mentioned, I suspenda prism-plate A at a distance from the window B instead of placing theprism-lights directly in the window. This prism-plate is preferably ofsuch dimensions that a space C will be left all around its edges, sothat the appearance of the building will not be changed and so that thedeep reveals will show. This also allows proper ventilation to beobtained by manipulating the window B. I prefer to suspend theprism-plate A approximately in the plane of the outer face of the wallDbut it is of course evident that its position may be varied somewhat, ifdesired, though of course it should not be placed far enough within thereveal to prevent the proper amount of light from falling upon it.

As shown in Fig. 1, I have suspended the prism-plate by means of aseries of supports E, placed at intervals around the plate.

In Fig. 3 I have shown the prism-plate as suspended from the cross baror rod F, located near the top of the window. The plate is preferablypivotally or movably connected with this rod or the rod movably mountedin bearings, the lower part of the prism-plate.

being held in position by the holding-pieces G. This latter constructionprovides a very simple, efficient, and artistic means for holding theprism-plate in position.

It will be seen that by placing the prismplate as herein indicatedlittle or none of the light will be obstructed by the walls of thebuilding. It is of course evident that the position of the prism-platemay be varied and that the mode of suspension may also be varied.

have not attempted to set forth the various details of construction ofthe several parts, as they will readily occur to those versed in theart, and I have simply attempted to show diagrammatically, as it were, aconstruction embodying my invention and which will make its applicationclear.

I clai1n- 1. The combination with a window having a deep reveal of aprism-plate consisting of a series of prism-lights provided with' prismssystematically arranged to produce an increased illuminating elfect,said prism-plate suspended near the outer face of the wall sur roundingthe reveal and being smaller in dimensions than said reveal, so thatwhen in position there is an intervening space between its outerboundary and the edges of the reveal, whereby the artistic effect due tothe reveal remains substantially unchanged.

